| 引用本文: | 陈皓， 左禹， 唐聿明， 赵旭辉.碳纤维复合材料在酸雨模拟液中的失效行为[J].中国表面工程,2014,27(1):106~113 |
| CHEN Hao, ZUO Yu, TANG Yuming, ZHAO Xuhui.Failure Behavior of Carbon Fiber Composites in Simulated Acid Rain[J].China Surface Engineering,2014,27(1):106~113 |
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| 摘要: |
| 为研究酸雨模拟液中碳纤维复合材料的失效行为，采用电化学阻抗法（EIS）研究碳纤维复合材料在酸雨模拟溶液中的失效过程，力学性能测试通过万能试验机进行，由傅里叶红外光谱仪（FTIR）和X射线光电子能谱仪（XPS）进行失效反应机理分析，并采用扫描电子显微镜（SEM）观察复合材料截面形貌。结果表明：全时浸泡试样的阻抗图谱变化不大，树脂层起到较好的屏蔽作用。外加恒电位阴极极化作用下试样破坏较快，介质快速渗入树脂层，引起试样低频阻抗模值和容抗弧半径的大幅下降，阻抗谱初期呈现扩散控制特征，随时间延长转为电荷转移和扩散的混合控制。全时浸泡条件下试样的力学性能变化不大，外加恒电位阴极极化条件下试样的弯曲和层间剪切性能大幅下降，树脂与基体间的界面结合力降低。试样在全时浸泡条件下基本不发生化学反应，外加恒电位阴极极化可促进碳纤维复合材料中树脂的水解，使树脂基体破碎，并生成疱状反应产物，加速材料的失效。 |
| 关键词: 碳纤维 复合材料 电化学 酸雨 失效 |
| DOI：10.3969/j.issn.1007-9289.2014.01.017 |
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| Failure Behavior of Carbon Fiber Composites in Simulated Acid Rain |
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CHEN Hao, ZUO Yu, TANG Yuming, ZHAO Xuhui
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School of Materials Scince and Engineering, Beijing University of Chemical Technology, Beijing 100029
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| Abstract: |
| To study the failure behavior of carbon fiber composites in simulated acid rain, electrochemical impedance spectroscopy (EIS) was employed to study the failure behavior of carbon fiber composites in stimulated acid rain. The mechanical properties were tested by universal testing machine. The failure mechanism was analyzed by FTIR and XPS. SEM showed the cross sectional microstructure of composites. The results show that the EIS could distinctly reflect the failure behavior under fulltime immersion and constant potential cathodic polarization, respectively. The EIS of specimens under immersion slightly change. The resin layer provids a shielding function. The EIS of specimens under constant voltage illustrates a greater degree of damage. Solution medium permeates into the resin layer rapidly, which caused the dramatic decrease of low frequency impedance magnitude and the radius of capacitive reactance arc. At early stage, the EIS plots show diffusion characteristics and then turn into the mixed control of electron transfer and diffusion. The mechanical property test indicates small changes of the specimens under immersion and a great degradation of the bending and inter lamination shear performance of specimens under constant potential cathodic polarization. The interface bonding strength was reduced. Component analysis and SEM reveale that there is no chemical reaction basically under immersion condition. Constant potential cathode polarization facilitate the hydrolyzation of the resin layer, leading to the resin’s fracture and blister, which boost the failure of the composites. |
| Key words: carbon fiber composites electrochemistry acid rain failure |
